International schools central london

I'm moving to London in january and am looking into international schools. I have a 3 yr old boy. I'm considering Southbank International School and ICS. Dors anyone have any considerations about these schools?I've read about a sexual abuse scaldal in Southbank a couple os yrs ago. And I've read ICS got a really bad review on an ofsted visit to the school. Any advices on other schools to look into? We will live in cenral London. Marylebone or Kensington area. I think ASL is impossible to get into. Thank you!